Four-stage LV Molniya
(rocket R-7 + stage I +
stage L carrying payload).
Launch mass of
LV Molniya - 305 t
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The outlook for developing a multi-stage launch vehicle
based on rocket R-7 offered new possibilities for exploring
the Moon and the nearest planets of the Solar System - Venus
The Government Decree on "Space Exploration Plans" of June
4, 1960 enacted to develop a four-stage launch vehicle for
missions to Mars and Venus.
The new four-stage launch vehicle was derived from rocket
P-7. Stage II of rocket P-9 using the engine designed by
S. A. Kosberg was employed (with certain modifications)
as stage III (stage I). Stage L designed by OKB-1 was used
as stage IV. In stage IV a closed-cycle liquid-propellant
engine 11D33 also designed by OKB-1.
The stage L PU ignition should be performed in space environment
after a 1.5- hour flight in the Earth orbit, not immediately
upon completion of stage III operation. Therefore, for this
period it was necessary to provide stage L with the stabilization
and attitude control system, as well as capabilities to
burn the engine in space environment. A control system for
stages I and L designed by NII headed by N. A. Pilyugin
was also provided on stage L.
An automatic interplanetary station for a mission to Venus
has been developed in the second half of 1960.
The first successful launch of LV carrying the automatic
interplanetary station took place on February 12, 1961.
The automatic station with upper stage L was placed into
orbit. It flied around the Earth and was the first in the
world to escape for Venus over the Equatorial Africa. This
station was named as "Venera-1".
On November 1, 1962 an automatic interplanetary station
was first successfully launched to Mars. The station was
named as "Mars-1".
Transportation of four-stage launch vehicle carrying
the automatic interplanetary station
Installation of four-stage launch vehicle carrying
the automatic interplanetary station to the launch pad
In a period from October 1960 to March 1964, a series of
LV accidents occurred because of a failure to ignite the
stage L engine. Through analyzing the accidents their cause
was revealed. It was a design error resulting in a failure
to ignite the stage IV (stage L) engine.
Stage L was provided with an individual engine ignition
unit which truss structure accommodated the attitude control
and stabilization system and the engine automatics including
storage batteries. The control system, 70s before the stage
L engine ignition, had to switch power supply of the attitude
control and stabilization system from the engine ignition
batteries to batteries of stage L. However, power was not
switched and stage Ë was uncontrollable for 70s. The stage
operation would be successful if angular disturbances did
not change its position beyond limits, power at that moment
being switched from the stage L control system. With the
disturbances beyond limits, gyroscopes came against stops
and the engine of stage L could not be ignited. The error
that caused so many troubles was eliminated. On April 24,
1964 the automatic interplanetary station was launched to
Venus and without critical comments regarding the launch
It should be noted that stage L was first injected from
a transfer in space environment. Its flight conditions,
environment, exposure to different factors were unknown.
There was much to discover, to encounter for the first time,
but there was no place to learn and nobody to teach. Lessons
were learned only from our own experience. This accounts
for a large number stage L failures. An additional difficulty
was that stage L was launched over the Atlantic, in the
Guinean Gulf region. To receive telemetry form stage IV
in real time was impossible at that time. Information was
transmitted from the ships of the Command and Measuring
Complex only in records and with a long delay.
On April 23, 1965 this launch vehicle delivered active data
relay satellite Molniya-1 to the artificial Earth satellite
orbit for purpose of developing a radio communication line
between Moscow and Vladivostok. On May 1, 1965, via this
satellite, citizens of the Far East were watching on their
TV sets a direct transmission of the Military Parade and
demonstration at the Red Square in Moscow. Since that event,
LV was named "Molniya".